The best months to visit Sri Lanka are January and February. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in Sri Lanka: January 24°C / 66mm; February 25°C / 66mm; March 28°C / 97mm; April 29°C / 193mm; May 29°C / 275mm; June 29°C / 288mm; July 29°C / 250mm; August 28°C / 223mm; September 30°C / 251mm; October 27°C / 358mm; November 25°C / 347mm; December 25°C / 174mm.